This is the 1045th most frequent Swedish word.
jävla
"Jävla" is a Swedish slang term meaning "damn" or "bloody," often used for emphasis or as a curse word.
Here, 'jävla' is used to emphasize the sentiment about the day, expressing frustration or discontent.
Vilken jävla dag det har varit!
What a damn day it has been!
In this sentence, 'jävla' works as an intensifier to highlight the positive quality of the party.
Det var en jävla bra fest igår.
It was a damn good party yesterday.
The term 'jävla' is used here to express irritation and dissatisfaction toward the noise.